diff --git a/lib/actions/spawn-command.js b/lib/actions/spawn-command.js
index 7d714fd7..771f0941 100644
--- a/lib/actions/spawn-command.js
+++ b/lib/actions/spawn-command.js
@@ -15,7 +15,7 @@ const spawnCommand = module.exports;
  * @param {object} [opt] any cross-spawn options
  * @return {String} spawned process reference
  */
-spawnCommand.spawnCommand = (command, args, opt) => {
+spawnCommand.spawnCommand = function (command, args, opt) {
   return spawn(command, args, {
     stdio: 'inherit',
     cwd: this.destinationRoot(),
@@ -31,7 +31,7 @@ spawnCommand.spawnCommand = (command, args, opt) => {
  * @param {object} [opt] any cross-spawn options
  * @return {String} spawn.sync result
  */
-spawnCommand.spawnCommandSync = (command, args, opt) => {
+spawnCommand.spawnCommandSync = function (command, args, opt) {
   return spawn.sync(command, args, {
     stdio: 'inherit',
     cwd: this.destinationRoot(),